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Hi,
short: Tandberg TDC4222 does not do sync transfers on Tekram DC-390U
(SYM53C875)
setup:
Linux 2.2.14 (openwall, reiserfs, current ide driver patches)
Tekram DC-390U with BIOS 3.20, drives as shown below, Plextor PX-32 is
terminated at bus cable end, host adaptor is supposed to be terminated
as well.
(no external SCSI devices)
General information:
Chip sym53c875, device id 0xf, revision id 0x3
IO port address 0xe000, IRQ number 9
Using memory mapped IO at virtual address 0xc8000000
Synchronous period factor 12, max commands per lun 32
Host: scsi0 Channel: 00 Id: 02 Lun: 00
Vendor: PLEXTOR Model: CD-ROM PX-32TS Rev: 1.02
Type: CD-ROM ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 03 Lun: 00
Vendor: YAMAHA Model: CRW4416S Rev: 1.0g
Type: CD-ROM ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 04 Lun: 00
Vendor: HP Model: HP35480A Rev: 1209
Type: Sequential-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 06 Lun: 00
Vendor: TANDBERG Model: TDC 4222 Rev: =07:
Type: Sequential-Access ANSI SCSI revision: 02
problem:
Now, during the BIOS bus scan, the Tekram reports the Tandberg tape
drive as offset 8 Byte/Handshake, 4 MXfers/s synchronous, in conformance
with the Tandberg documentation. Loading the st module (2.2.14)
Doing mt status on both tape drives results in:
(from syslog, date and host snipped away for readability)
st: bufsize 32768, wrt 30720, max buffers 4, s/g segs 16.
Detected scsi tape st0 at scsi0, channel 0, id 4, lun 0
Detected scsi tape st1 at scsi0, channel 0, id 6, lun 0
sym53c875-0-<4,*>: FAST-5 SCSI 5.0 MB/s (200 ns, offset 8)
sym53c875-0-<6,*>: target did not report SYNC.
Why does the Tekram BIOS report the Tandberg drive as 4 MB/s while the
SYM driver reports the drive as using async? The sym driver is at its
default settings (or does it read ncr53c8xx=tags:32,debug:0x200,specf:1?)
Is this the driver's or the drive's fault? Is it that the max sync xfer
rate is only 4 MB/s? How do I track this problem down to is root?
How do I fix this?
--
Matthias Andree
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